Meeting Links to include multiple external attendees

We need to be able to send a customer our meeting link and allow them to add multiple people from their office to the meeting by adding their emails to the meeting details.

Calendly is our preferred service right now because they make it simple for people to add an email and it puts it on anyone’s calendar who’s email was added to the meeting invite. We tried to use HubSpot but kept missing meetings or it was a pain to manually add people and dont’ get me started on cancellations and time/date changes.